1.

In /_\ABC prove that (r_1)/(bc) + (r_2)/(ca) + (r_3)/(ab) = 1/r - 1/(2R).

Answer»

` (1)/ (R ) +(1)/ ( R) `
` ( 1)/(r ) - ( 1)/( R ) `
` ( 1)/(r ) + I(1) /(2R)`
` ( 1) /( r ) - (1)/( 2 R ) `

ANSWER :D


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